<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt />
      </div>
      <!-- 登录表单区域 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="iconfont icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input
            v-model="loginForm.password"
            prefix-icon="iconfont icon-3702mima"
            type="password"
          ></el-input>
        </el-form-item>
        <!-- 按钮区域 -->
        <el-form-item class="btns">
          <el-button type="primary" @click="login">登录</el-button>
          <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
import { initDynamicRoutes } from '../router'
export default {
    data() {
        return {
            // 这是登录表单的数据绑定对象
            loginForm: {
                username: 'admin',
                password: '123456'
            },
            // 这是表单的验证规则对象
            loginFormRules: {
                // 验证用户名是否合法
                username: [
                    {
                        required: true,
                        message: '请输入登录名称',
                        trigger: 'blur'
                    },
                    {
                        min: 3,
                        max: 10,
                        message: '长度在 3 到 10 个字符',
                        trigger: 'blur'
                    }
                ],
                // 验证密码是否合法
                password: [
                    {
                        required: true,
                        message: '请输入登录密码',
                        trigger: 'blur'
                    },
                    {
                        min: 6,
                        max: 15,
                        message: '长度在 6 到 15 个字符',
                        trigger: 'blur'
                    }
                ]
            }
        }
    },
    methods: {
        // 点击重置按钮，重置登录表单
        resetLoginForm() {
            // console.log(this);
            this.$refs.loginFormRef.resetFields()
        },
        login() {
            this.$refs.loginFormRef.validate(async valid => {
                if (!valid) return
                const { data: res } = await this.$http.post(
                    'login',
                    this.loginForm
                )
                if (res.meta.status !== 200) {
                    this.$message.error('登录失败！')
                }
                console.log(res)
                this.$store.commit('setRightList', res.rights)
                this.$store.commit('setUserName', res.data.username)
                sessionStorage.setItem('token', res.data.token)
                this.$message.success('登录成功')
                // 根据用户所具备的权限来动态添加路由规则
                // 这里也有个BUG，因为是在登录时动态添加的二级权限路由
                // 所以router.js在页面刷新后路由将会初始化，动态添加路由将不存在
                // 解决方法就是在根组件APP.vue的created钩子函数中也调用动态添加路由方法
                initDynamicRoutes()
                this.$router.push('/home')
            })
        }
    }
}
</script>

<style lang="less" scoped>
.login_container {
    background-color: #2b4b6b;
    height: 100%;
}

.login_box {
    width: 450px;
    height: 300px;
    background-color: #fff;
    border-radius: 3px;
    position: absolute;
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%);

    .avatar_box {
        height: 130px;
        width: 130px;
        border: 1px solid #eee;
        border-radius: 50%;
        padding: 10px;
        box-shadow: 0 0 10px #ddd;
        position: absolute;
        left: 50%;
        transform: translate(-50%, -50%);
        background-color: #fff;
        img {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            background-color: #eee;
        }
    }
}

.login_form {
    position: absolute;
    bottom: 0;
    width: 100%;
    padding: 0 20px;
    box-sizing: border-box;
}

.btns {
    display: flex;
    justify-content: flex-end;
}
</style>
